# Relationship history for MSHA mine 2003127

Current hierarchy: **Thomas  Sturrus → M-37 Concrete Products Company → 4-MILE PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** M-37 Concrete Products Company → 4-MILE PIT; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Sturrus → 4-MILE PIT; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Sturrus → M-37 Concrete Products Company; 1999-06-01 to current/open; source msha-controller-operator-history